ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29C%28%3DO%29c1c%28nn2ccccc12%29C%28C%29C/file?format=sdf&get3d=True  -- CC%28C%29C%28%3DO%29c1c%28nn2ccccc12%29C%28C%29C could not be loaded.